#define _CRT_SECURE_NO_WARNINGS  1

#include<stdio.h>


void stract(char*arr,char* arr2)
{
	while (*arr != '\0')
	{
		arr++;
	}
	while (*arr++ = *arr2++)
	{
		;
	}
}
int main()
{
	char arr[100] = "abcd ";
	char arr2[] = "efg";
	stract(arr, arr2);
	printf("%s", arr);
	return 0;
}